Steam-boiler



(No Model.) 2 Sheets-Sheet 1.

J. G. BRYAN.

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(No Model.) 2 Sheets-Sheet 2. J.G.BRYAN.

STEAM BOILER.

No. 388,340. Patented Aug. 21, 1888.

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NITED STATES JAMES G. BRYAN, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-=BOILER.

SPECIFICATION forming part of Letters Patent No, 388,340, dated August 21, 1888.

(No model.)

To all whom it may concern:

Be it known that I, JAMES G. BRYAN, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Steam-Boilers and ater-Heaters, of which the following is a specification.

One object of my invcnion is to so construct a steam-boiler or water-heater as to maintain a constant and effective circulation of the water adjacent to surfaces in direct contact with the fuel or products of combustion, a further object being to simplify and chcapen the construction of the boiler or heater. These objects I attain in the manner which I will now proceed to describe, reference being bad to the accompanying drawings, in which- Figure 1 is a transverse section of a stcanr boiler or water-heater constructed in accord ance with my invention; Fig. 2, a longitudinal section on the line 1 2, Fig. 1; Fig. 3, a sectional plan on the line 3 4, Fig. 1; Fig. 4, a sectional plan on the line 5 (3, Fig. 2; and Figs. 5 and 6 detached views of the circulating-tubes.

A is the water-vessel of the boiler or heater, which is contained within an outer casing, B, and is supported at some distance above the fire-pot, which consists of a watcrjacket, D, a series of pipes, a, forming communications between the lower portion of the water-vessel A and the lower part of said jacket D, and other pipes, b, forming a communication between the upper part of said jacket and the water-vessel near the level of water therein. By this means not only is the water in the vessel A subjected to the heat of the products of combustion arising from the fuel beneath said vessel and circulating around the same and around the pipes to b, but the water is brought into contact with the intensely heated inner wall of the water-jacket D, which forms the casing of the fire-pot. The feed-water is also introduced into the water-jacket D through a pipe, (I, in such limited quantities as may be demanded to maintain the proper level in the vessel A,and the latter is provided with safetyvalve, steam and water gages, &c., as usual.

The water-vessel is supported by means of the circulatingpipes a I), each of these pipes comprising two portions, m and n, of slightlydifferent diameters, the larger portion of each pipe having at one end a right-hand screwthread and at the other end a left-hand screwthread, one of these threads being adapted to a threaded opening in the top of the Waterjacket D and the other to a threaded opening in the bottom of the water-vessel A, as shown in Fig. 1. That portion ofthe casingB surround ing the vessel A forms a combustion-chamber through which, by means of horizontal partitions 8, having openings ton opposite sides of the axis, the products of combustion are so caused to circulate as to come into contact with the bottom, side walls, and top ot the watervessel, whereby alarge proportion of the heat is utilized before the products of combustion are allowed to escape.

It will be observed that in carrying out my invention the communications between the water-vessel and the watcrjacket ot' the firepot are provided by means of simple straight pipes, all bends or elbows being avoided, and the liability of leakage due to defectivejoints thus materially reduced.

I claim as my invention- 1. The combination, in a steanrboiler or water-heater, of the water-vessel, the annular water-jacketed fire-pot, and pipes at and 1) ex tending between the vessel and water-jacket, said pipes I) projecting upward in the watervessel and the pipes a projecting down into the water jacket, all substantially as specified.

2. The combination of the water-vessel, the fire-pot beneath the same, an outer casing,and horizontal partitions having openings on opposite sides of the axis of the water-vessel, whereby the products of combustion are caused to circulate beneath, around, and above said vessel, all substantially as specified.

3. The combination of the water-vessel, the water-jacketed fire-pot and connecting-pipes, each comprising two portions, one larger in diameter than the other, the larger portion having right and left screw-threads adapted to openings in the casings of the water-vessel and jacket, all substantially as specified.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

JAMES G. BRYAN.

Vitnesses:

WILLIAM D. CoNNER, HARRY SMITH. 

